Petroleum Equipment Institute - trade association for companies involved in the petroleum marketing and liquid handling equipment industry.

Weatherford (NYSE:WFT) - oilfield services and equipment.

Varco International - engages in design, manufacture, sale, and rental of drilling tools, equipment, and integrated systems and rig instrumentation used for oil and gas drilling world-wide

Nabors Industries (NYSE:NBR) - drilling contractor conducting oil, gas, and geothermal land operations

Pride International (NYSE:PDE) - drilling contractor providing offshore and onshore drilling, workover, and related services

Bluewater Companies - turnkey contractor specializing in design, construction, and lease of single point mooring (SPM), CALM Buoys, and floating storage and offloading (FSO, FPSO) systems for the offshore oil and gas industry

Lufkin Industries (Nasdaq:LUFK) - designs, fabricates, and markets power transmission products, oil field pumping units, foundry castings, and highway trailers.

Hydril (Nasdaq:HYDL) - provides oilfield equipment, marine and offshore products, blowout preventers, subsea drilling systems, and pressure control systems.

Grant Prideco (NYSE:GRP) - manufactures tubular products used in the drilling and completion of oil and gas wells

Network International - sells surplus oil and gas, construction, and power equipment through auctions and private sales.

Mitcham Industries, Inc. (Nasdaq:MIND) - specializes in the short-term leasing of 3D seismic equipment to the oil and gas industry.

JL Bryan Oilfield Equipment - production gas units, oil and gas separators, heater treaters, tanks, and other oilfield equipment for sale

Radoil - manufactures offshore equipment, specializing in j-lay towers, offshore reels, bop reels, and more

Gearench - manufacturers of oil and water well tools for the petrochemical industry.

GenTex Oilfield Equipment Manufacturing - international suppliers and manufacturers of hot oil units, pressure trucks, heaters, pumps, valves, coils, and more

Environ Products, Inc. - manufacturer of underground secondary containment system which consists of coaxial flexible pipe, entry boots, tank and dispenser sumps, and assorted fittings

SCFM Compression Systems - manufacturers of custom-engineered natural gas compression packages

Global Equipment Exchange - research, value, buy, and sell new and used energy-related equipment

R&M Energy Systems - providing wellheads, downhole progressing cavity pumps, tubing rotators, sucker rod guides, closures, and hydraulic drilling motor power sections for oil and gas discovery and production.

Ace Tank & Equipment Co. - manufactures and distributes petroleum and industrial storage tanks and petroleum equipment.

Carbo Ceramics (NYSE:CRR) - manufacturer of high tech ceramics for the oil and mining industries

CE Franklin Ltd. - distributing a full range of products such as pipe, valve, fittings and industrial maintenance supplies

Computalog Ltd. - supplier of wireline services for the oil and gas industry

NQL Drilling Tools Inc. - designs and manufactures downhole tools and services to the oil and gas, utility, and environmental industries.

Petro-Chem Development Company, Inc. - line of heat transfer equipment, parts, and service for the refining, petrochemical, offshore and onshore production industries.